Immature teratoma of the ovary grade 3, with karyotype analysis.

The relationship between dermoid cysts and immature teratomas has been investigated by study of gross and microscopic data. Karyotypes with banding analysis, already numerous for dermoid cysts, have recently been obtained for immature teratomas. This grade 3, Stage III immature ovarian teratoma was of probable premeiotic origin, as evidenced by chromosome heteromorphisms identical to those of the host cells. The relationship of this pattern to that of other immature teratomas and dermoid cysts is discussed.